Tarutius
From LSJ
αὐτὸν κέκρουκας τὸν βατῆρα τοῦ λόγου → you have struck the very threshold of the argument, you have struck the most important and chiefmost point
Tarutius: ii, m.,
I a Roman proper name: L. Tarutius Firmanus, a celebrated astrologer, Cic. Div. 2, 47, 98.
